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1997 Fiji-Tonga earthquake : ウィキペディア英語版 | 1997 Fiji-Tonga earthquake
The 1997 Fiji-Tonga earthquake occurred south of the Fiji Islands (about 190 km WSW of Nuku'alofa, Tonga, and 255 km SE of Ndoi Island) on 14 October at 09:53 UTC. This earthquake was located in the central part of the Fiji-Tonga subduction zone and it had a magnitude of Mw 7.8. The rupture area was about ~50 km × 25 km, and the average slip was estimated to be .〔http://epsc.wustl.edu/~tibi/papers/2001JB000361.pdf〕 This earthquake could be felt in Wellington, New Zealand.〔http://earthquake.usgs.gov/earthquakes/eqarchives/significant/sig_1997.php〕〔http://neic.usgs.gov/neis/eq_depot/1997/eq_971014/〕 == Tectonic setting ==
The Pacific Plate is subducting beneath the Australian Plate in the Fiji-Tonga subduction zone. The Tonga Trench is linear, fast converging, and seismically active.〔http://www.earth.ox.ac.uk/~tony/watts/Tonga_Louisville.html〕 Mantle seismicity is active in this area.〔''Earth's Catastrophic Past and Future: A Scientific Analysis of Information Channeled by Edgar Cayce'' by Hutton, W. and Eagle, J. (p. 59)〕 There is a belt of deep earthquakes in the west of the Tonga Trench.〔''Plate tectonics: how it works'' by Cox A., Hart, R. B. (p. 29)〕 There are more earthquakes with focus depth h ≥ 300 km occurring in the Tonga-Kermadec region than in all other regions combined.〔''Deep Earthquakes'' by Frohlich, C. (p. 384)〕
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